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    Volume 51, Issue 1 (March 2021)

    Special Issue Paper

    Comparative Investigation on the Curing Behavior of GS-Stabilized and Cemented Soils at Macromechanical and Microstructural Scales

    (Received 6 October 2020; accepted 2 December 2020)

    Published Online: 18 March 2021

    CODEN: JTEVAB

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    Abstract

    In recent years, transportation engineering and construction of urban infrastructures have been developing rapidly in China. On the other hand, green construction demands recycling materials from industrial facilities and exploring the potential uses of waste during a second life cycle. Emerging soil stabilized materials, as alternatives of traditional cement materials, greatly improve the recycling of waste materials and the ground performance. Gypsum-slag (GS) curing agent is a new type of water-hardening inorganic gelling material composed of cement, steel slag, mineral slag, desulfurization gypsum, and additive. The unconfined compressive strength of soils stabilized by GS and by cement was investigated in this study. Meanwhile, the microstructure of stabilized soils was detected by means of scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and X-ray diffraction (XRD) tests. The relationship between apparent porosity and unconfined compressive strength was established by the Python image processing method. The results show that presence of the GS soil hardening agent changes the microstructure and increases the unconfined compressive strength of the original soils. A colloidal substance is generated to envelop the soil particles and fill the pores when the curing agent and soil are fully mixed and reacted. In comparison, the effect of stabilization generated by GS is proven to be greater than that of cement in view of both microstructure and macroscopic strength.

    Author Information:

    Chen, Xin
    Institute of Foundation and Structure Technologies, Zhejiang Sci-Tech University, Hangzhou,

    Yu, Feng
    Institute of Foundation and Structure Technologies, Zhejiang Sci-Tech University, Hangzhou,

    Hong, Zhe-ming
    Institute of Foundation and Structure Technologies, Zhejiang Sci-Tech University, Hangzhou,

    Pan, Li-fang
    Institute of Foundation and Structure Technologies, Zhejiang Sci-Tech University, Hangzhou,

    Liu, Xing-wang
    Zhejiang Provincial Academy of Architectural Design and Research, Hangzhou,

    Li, Ying
    Zhejiang Provincial Academy of Architectural Design and Research, Hangzhou,


    Stock #: JTE20200631

    ISSN:0090-3973

    DOI: 10.1520/JTE20200631

    Author
    Title Comparative Investigation on the Curing Behavior of GS-Stabilized and Cemented Soils at Macromechanical and Microstructural Scales
    Symposium ,
    Committee D04